Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.815
diff -u -p -r1.815 common.inc
--- includes/common.inc	1 Nov 2008 21:21:34 -0000	1.815
+++ includes/common.inc	30 Oct 2008 17:47:49 -0000
@@ -615,6 +615,7 @@ function _drupal_error_handler($error_le
       E_RECOVERABLE_ERROR => 'Recoverable fatal error'
     );
     $backtrace = debug_backtrace();
+
     // We treat recoverable errors as fatal.
     _drupal_log_error(isset($types[$error_level]) ? $types[$error_level] : 'Unknown error', $message, $backtrace, $error_level == E_RECOVERABLE_ERROR);
   }
@@ -673,10 +674,25 @@ function _drupal_log_error($type, $messa
   // Do it early because drupal_set_message() triggers an init_theme().
   if ($fatal && (drupal_get_bootstrap_phase() != DRUPAL_BOOTSTRAP_FULL)) {
     unset($GLOBALS['theme']);
-    define('MAINTENANCE_MODE', 'error');
+    if (!defined('MAINTENANCE_MODE')) {
+      define('MAINTENANCE_MODE', 'error');
+    }
     drupal_maintenance_theme();
   }
 
+  // When running inside the testing framework, we relay the errors
+  // to the tested site by the way of HTTP headers.
+  if (preg_match("/^simpletest\d+/", $GLOBALS['db_prefix']) && !headers_sent() && !defined('SIMPLETEST_DONT_COLLECT_ERRORS')) {
+    static $number = 0;
+    $assertion = array(
+      $message,
+      $type,
+      $caller
+    );
+    header('X-Drupal-Assertion-' . $number . ': ' . rawurlencode(serialize($assertion)));
+    $number++;
+  }
+
   // Force display of error messages in update.php.
   if (variable_get('error_level', 1) == 1 || (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'update')) {
     drupal_set_message(t('@type: %message in %function (line %line of %file).', array('@type' => $type, '%message' => $message, '%function' => $caller['function'], '%line' => $caller['line'], '%file' => $caller['file'])), 'error');
Index: modules/simpletest/drupal_web_test_case.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/drupal_web_test_case.php,v
retrieving revision 1.53
diff -u -p -r1.53 drupal_web_test_case.php
--- modules/simpletest/drupal_web_test_case.php	1 Nov 2008 21:21:35 -0000	1.53
+++ modules/simpletest/drupal_web_test_case.php	30 Oct 2008 17:51:51 -0000
@@ -799,6 +799,7 @@ class DrupalWebTestCase {
         CURLOPT_RETURNTRANSFER => TRUE,
         CURLOPT_SSL_VERIFYPEER => FALSE,  // Required to make the tests run on https://
         CURLOPT_SSL_VERIFYHOST => FALSE,  // Required to make the tests run on https://
+        CURLOPT_HEADERFUNCTION => array(&$this, 'curlHeaderCallback'),
       );
       if (preg_match('/simpletest\d+/', $db_prefix, $matches)) {
         $curl_options[CURLOPT_USERAGENT] = $matches[0];
@@ -831,6 +832,25 @@ class DrupalWebTestCase {
   }
 
   /**
+   * Reads headers and registers errors received from the tested site.
+   *
+   * @see _drupal_log_error().
+   *
+   * @param $ch the cURL handler.
+   * @param $header a header.
+   */
+  protected function curlHeaderCallback($ch, $header) {
+    // Errors are being sent via X-Drupal-Assertion-* headers,
+    // generated by _drupal_log_error() in the exact form required
+    // by DrupalWebTestCase::error().
+    if (preg_match('/^X-Drupal-Assertion-[0-9]+: (.*)$/', $header, $matches)) {
+      call_user_func_array(array(&$this, 'error'), unserialize(urldecode($matches[1])));
+    }
+    // This is required by cURL.
+    return strlen($header);
+  }
+
+  /**
    * Close the cURL handler and unset the handler.
    */
   protected function curlClose() {
Index: modules/simpletest/tests/session_test.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/tests/session_test.module,v
retrieving revision 1.2
diff -u -p -r1.2 session_test.module
--- modules/simpletest/tests/session_test.module	15 Sep 2008 15:18:59 -0000	1.2
+++ modules/simpletest/tests/session_test.module	30 Oct 2008 17:47:49 -0000
@@ -33,7 +33,12 @@ function session_test_menu() {
  * Page callback, prints the stored session value to the screen.
  */
 function _session_test_get() {
-  return t('The current value of the stored session variable is: %val', array('%val' => $_SESSION['session_test_value']));
+  if (!empty($_SESSION['session_test_value'])) {
+    return t('The current value of the stored session variable is: %val', array('%val' => $_SESSION['session_test_value']));
+  }
+  else {
+    return "";
+  }
 }
 
 /**
Index: modules/simpletest/tests/system_test.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/tests/system_test.module,v
retrieving revision 1.4
diff -u -p -r1.4 system_test.module
--- modules/simpletest/tests/system_test.module	15 Oct 2008 16:05:51 -0000	1.4
+++ modules/simpletest/tests/system_test.module	30 Oct 2008 17:47:49 -0000
@@ -146,6 +146,7 @@ function system_test_modules_uninstalled
  * Menu callback; generate warnings to test the error handler.
  */
 function system_test_generate_warnings() {
+  define('SIMPLETEST_DONT_COLLECT_ERRORS', TRUE);
   // This will generate a notice.
   $monkey_love = $bananas;
   // This will generate a warning.
@@ -159,6 +160,7 @@ function system_test_generate_warnings()
  * Menu callback; trigger an exception to test the exception handler.
  */
 function system_test_trigger_exception() {
+  define('SIMPLETEST_DONT_COLLECT_ERRORS', TRUE);
   throw new Exception("Drupal is awesome");
 }
 
@@ -166,5 +168,6 @@ function system_test_trigger_exception()
  * Menu callback; trigger an exception to test the exception handler.
  */
 function system_test_trigger_pdo_exception() {
+  define('SIMPLETEST_DONT_COLLECT_ERRORS', TRUE);
   db_query("SELECT * FROM bananas_are_awesome");
 }
Index: modules/trigger/trigger.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/trigger/trigger.module,v
retrieving revision 1.20
diff -u -p -r1.20 trigger.module
--- modules/trigger/trigger.module	6 Oct 2008 12:55:56 -0000	1.20
+++ modules/trigger/trigger.module	30 Oct 2008 17:47:49 -0000
@@ -393,8 +393,8 @@ function trigger_user_login(&$edit, &$ac
 /**
  * Implementation of hook_user_logout().
  */
-function trigger_user_logout(&$edit, &$account, $category) {
-  _trigger_user('logout', $edit, $account, $category); 
+function trigger_user_logout(&$edit, &$account) {
+  _trigger_user('logout', $edit, $account); 
 }
 
 /**